1. The problem statement, all variables and given/known data Integrate 1/(x2 +11x +29) 2. Relevant equations 3. The attempt at a solution I'm doing something wrong, but can't figure out what... Complete the square so that the denominator equals (x+2)2+25 Then divide by 25: ((x+2)2)/25 + 1 Move that 25 into the squared part: ((x+2)/5)2+1 Substitute the squared part for u. Find du/dx = 1/5, and therefore 5du=dx Now we have 5*(integral sign) du / (u2+1) This gives 5arctan(u)+C --> substitute u back for what you had before. But the answer is 1/5arctan(u). Where did I go wrong?